swanson



H. J. SWANSON.

GRINDER.

APPLxcATloN HLED MAR* 1, 1920.

Patented Dec. 28, 1920.

3 SHEETS-SHEE l.

M .m W WWHIMUWMNMMH" Q 1 attorno H. J. SWANSUN.

GRINDER.

APPUCANON men MAR. 1920.

1,364,006. Patented Dec. 28, 1920.

3 SHEETS-SHEET 2.

www y Ssamwm W ony wmwsow i Lug we auml/@m UNITED sTATEs PATENT OFFICE.

HARRY J. SWANSON. OF DETROIT, MlCI-IIGAN. ASSIGNOR TO DETROIT MACHINE TOOL COMPANY, 0F DETROIT. MICHIGAN. A CORPORATION OF MICHIGAN.

GRIN DER.

Application tiled March 1. 1920.

liv it known that l. ll.\1a:\v .l. Suuxaox, a viti/.vn ol' tll'll l`nitvd Stati-s. and rvsiding' at llvtroit. in tliv rount)V oll Wayin' and Statv ol` Mivliig'an. harv inrvnlvd nvu' and lin prorvd (lrindvrs. ot' whirli thv following' i- :i Hpvvilivation.

This inrvntion rvliitvs to thv von:.trnrtion olI thv lioldvr` or Kn'uidw tor oi'lindrii-al lilanlis u'liirli arlI to liv lground truv. and it.` olivivvt ia to proridv a nidi` ol tlm .-liai'ai-tvi' and a support tlivrvlor u'liit-h inai bv ad insti-d to nivvt all possible' rvipiirvnu-nls.

This inrvntion ronsiab` in a \\or|\' holder voniprising bladvs. pleilva or guidi adaptod lo vug'agjv and Li'uidv vlvlindriial blanlt.`r along' thv l "rindinL|- lwurl'avv olI ai j irindiiul` u'hvvl. and supporting' nivvlianisin l'or [liv guidi 'nlivrvlrr thor nia bv rotatvd on :in axis.

parallvl to thv axial ol' tliv u'orh.

lt i'urthvr vonsistb` in providing a supportv in;lr invvhanisin l'or said guidon \\'hivh will pvrinit tlul fluidos to liv rotatvd :is a unit about an axis substantially pvrla-ndic-nlar to thv axin otl thv \\'orl\',

lt also ronsists in providingY invanal for moving' this rotatablv guiditou'ard and l'roln thv whvvl. i

lt also vonsisty in tho dvtails of ronrztruvtion illnstratvd in thi` avvonipanlring drawY ingr4 and particularly pointvd out in thv vlaims.

ln tho :wvinnpanying dra wings. Fig'ul'v l is a sido .lvvation oi' this improved Igrindingr machinv with a portion ot' thv tablv broken away to show tliv. mvthod ol' attaching' thoreto the pedestals for the `grinding; whvol arbor. Fig. 2 is a plan ol' tho ,grinding lnavhinv. Fig. 3 is an vloration oi` thc work lioldor or guido blot-k. Fig'. -t is a sort-ion on thu linv 4 4 of Fig. Il. Fig. 5 is a svi-tion on thi` linv .3 5 of Fig. l on a largvr scale, Figi. t3 is an und elovation ofthe work holder on a larger scolo. i

Similar roforeni-.v charm-tors4 riel'ur to liloI pa rta throughout` thv Svrvral rivu's.

This Kgrinding nanfhinv is ot' tho sanno gvn vral vharavtoi :s that shown in latvnt No. 1,106,2wt3. grantld August l1. i914. to llt ll. Grant. and is or the purposv ol' grinding' vylindrival blanka4 suvh an thv rollers ol' roller bearings, wrist pins ol' nginvs and other parts ot mavhinvry whit-h must bo n.5V

Specification 0l" Letters Patent.

Iat'vntod Dov. 28. 15h20.

Serial No. 362.336.

is adaptvd to grind thvsu vi'lindrival blanks without thv nvvvssitr otE previously centering thvin and niounling'thvin miranti-51's.

'llal pt-dvstal l shown in Fig. l has securvd to il a talilv or platl'orm 2 which is providvd 60 with a rini Il alon; r its outer vdgvs to prtL wol tbv u'astv ol' tlnoil or othvr grinding: liquid. A\ varringv -l i5 .slidable on the table by ilnwww Tl in a wvll known mannvr u'hvn ila` vrou i Iuruvd by thv handlv (5. Pro 65 lp. tiny; np from llnvarriagu but forming a part tlivrvot' is a pont T in whivh thv shaft S, nlm-li i\ indiratvd in dottvd linvs vin Figs. l :uid 2.. i.- rotatahlv. This shaft is rigidly 2onnwtvd lo thv support or vhuvk 9 for they 70 `fnidibloi'hV lll. 'l`liv vhnvk il habl a senti-cylindrival llvaringg aurl'avv 1l provided with :L dow-tail ,u'roorv 12 to rvvvivc the rib 13 0n tho guidibIoi-li. nut li on the shaft S lor|-:.\4 thv diatt. rhuvk and guide block from 75 turning. 'l`hv vliurk is formed with vertical dots lf :lt-ross wliivh tht` bolts i6 extend and arv adaptvd to dra u' thv metal on each sido of thvav Slots toguthvr and thus grip the rib 155 on thv f fuidv blovh and prevent it from ro` S0 tzitingg'.

vl`hv pvdvstalb' 1H support :in arbor v19 on u hii'li i\ mounted a pullv \Y 2i) for thu driving bvlt :2l and thv frustovvonival grinding wheel 2'. u'hivh is turnvd in tho direvtion of thc :11H85 row in Fig. l. 'l`hv shaft 8 is substantially radial to thv l'avv ot' this wheel and the axis ot' thv guitlv block 1U is normally parallel thereto.

Thv guido blovk t() is about a half cylinder, its favos 23 and 2l being vut back and ini'linvd to form a very obtuse angle with each othvr. .\t the ccntvr of the cylinder the block 'ia rut awav to torni a rocosa to receive the uorlt 'l'ho blovk also has a. central groove 95 2.3 to rvvvivv thv ventral bark blade or guide tt/irhosv inner edge is at right singles to its parallvl sides and which is properl adjusted b r thv wrvws 2T, shown in dotto lines in Figs. l and 3.

lhv bat-k blade or guide 26, the top blade QS. and thv bottom blade 29 are preferably of hard steel. ground straight. The to :md bottoni work guides are formed wit. pa rallvl favos and ends and are preferably svvnrvd-to the guide blovk itl by means oi bolts 3U whol heads arv` slidable in they T-groovos 39 in thv guide blovk. The outer sidi ol' tbv. top guide should Slant back from thv plano of thv outer sida` ,of the bottom blade about thirteen and one-half degrees and the angles' between its parallel sides and its ends 33 is preferably sixty one and one-half degrees. These ends arel made alike so that the guide may he reversed when Worn. A clearance between the top guide and the work of about ten to fifteen one thousandths of an inch on rough work and about one half that for closeV work is desirable. The bottom guide also has par` allel sides and the angle of its top and bottom ed es is about forty five degrees to its sides. prefer the angle between the bottom guide and the center or hack guide to be about seventy six and onehalf degrees.

Rotary movement ot' the guide bloi-k pro-- duces a. variation in the co-etlicient oi' frir-` tion because of the resultant of the pressures of the grinding wheel and thil back guide resisted by the bottom guide. 'l'hc center of the work and the center of rotaV tion of the guide block should. be the saine and the line of Contact of the grindingr wheel is always the saine for any position of the guide block. By turning the guide block to the left in Fig. 6. the friction of the work on the bottom blade is decreased. Turning the guide block moves the point oi' intersection of the plane of pressure between the workand wheel up and down the bearing edge of the back guide plate.

Assuming the work to be a polygon lia\-- ing a large number of sides, it will be noticed that by turrling the guide block. it will be possible to obtain a position when an angle of the polygon will contact with the grinding wheel while a side of thil poly.lv gon will Contact 'viith the end of the bark guide. This will of course result in a minute flat taking the place of the angliand further resiilt's in a polygon in which the number of sides heroines so great that prabticall perfectly round work is obtained. {han} found that to obtain this perfect work, tbc circumferential distance` from the line of contact between the work and the grinding wheel to the line oi' con tact between the work and the bottom blade should be suoli that it cannot be divided equally into the circumference of either the work` or the wheel.

The taper of the grinding wheel causes the Work to move endwise between the blades in the direction of the larger di ameter of the wheel. By turning the guide block support on its shaft the rate of this fced`may be varied. the fastest feed being had when the lwork and the arbor ol thc wheel are in the same plane.

The face 23 of the guide block may he formed with grooves Sti to constitiuiI passages for the oil or other grinding liquid which flows to the rotating cylindrical Work. The T-groovcs, 32 in this 'tace also serve this purpose` lt will be understood that port may be used in connection with a c vindrical grinding wheel. in which case means must be provided tor feeding the work across the face of the wheel. (lr it muy be used in connection with a wheel which has its grinding surface on one side or at any angle between that of flat disk and a cylinder.

The details of construction and the proportions of the parts may all be changed bv those skilled in the art without departing from the spiritof my invention as sei t'oi'th 1n the following claims.

l r-lainizLA l. work holder comprising a guido block and plates adapted to engage and guidecylindrical blanks along the face oiV` a grinding wheel.y a .shaft extending siibstanY iiall",V radially to the iacc of the wheel and on which the guide block is mounted, and nicans rotatably.supporting said shaft, said moans comprising a` carriage movabley toward and from the grinding wheel. said guide block being formed substantially semi-cylindrical and said shaft being formed with a head having :i semi-cylindrical recess in which said guide block is rotatably mounted.

A work 4holder comprising,r a substantiallyY semi-cylindrical guide `block having an axial groove and three lguide plates mounted thereon to engage and guide cylindrical blanks along the grinding surface ol n grindingr wheel. the middle guide being" :it substantially right angles to one of the other guidi-s which 'are attached to the flat .sides oA tbc guide block. one on each side ot' tbc axial groove.

il, work holder i-oiiiprising a substantially scini-cylindrical guide block having an axial groove and three guide plates mounted thcroon to engage and guide cylindrical blanks alongthe grinding surface of a ,'i'i1idin;- wheel, the iniddliguide being at substantially right angles to one otthe other guides which arc attached tothe lint sides of the guide block. one on cach .side il the axial groove. a` shaft extending' substiiryv tially radially ot' the face oi" the grinding wheel and on which the guide block is mounted. and means to rotatably support said shaft.

4. A work holder comprising a substantially semi-cylindrical guide block having an axial groove and three guide plates mounted thereon to engage and guido cylinli-ical blanks along' the grinding surface o't' a grinding wheel, the middlel guide being :it substantially right ang-lcs to one ot' thc other guides which arc attached to the Hat sides of the guido` block. one on each .sido of the Work sup stantially radinllyrol" the lince ol" the grinding r-,fiicel and on which the guide leek the guide block from turning in said recess.

5. A Work holder Comprising e guide block und plates adapted to engage and guide cylindrical blanks along the grinding surface of ay grindin Wheel, e shaft extending substantially ra ially to the face of the wheelr and on wh ich the guide block is mounted, and means rotatably supporting said shaft.

6. A Work holder comprisingr e guide block and platesl adapted to engage and guido ffylindrical blanks along the fare of a grinding wheel, a shnl'i extending substantially radiallyv to the fare of the Wheel and on which the guide hloel is mounted, and means rotatably supporting said shaft.

said means comprising a carriage movable toward and from the grinding wheel,

7. A Work holder comprising e guide block and tliree guide plaies adapted to engage and guide rylindricel blanks along the grinding surface of a grinding wheel turnA ing on a horizontal axis. `the middle 'guide being nt snhstantiallvf right angles to the upper guide and at an angle of substantially seventy six and one-half degrees to the lower guide. Y

i S. A work holder roniprisinej :i guide block and three guide pletesfiulaped to engage and guide cylindrical binfnlrs along;r the l @winding surf-ave of a grindingywheel turningr ona horizontal axis. the middle/guide seventy six and one-half degrees to the lower guide, the bearing end of the middle guide being et right angles to its parallel sides and the bearing end of the lower guide being at :in angle of substantially forty five degrees to iis parallel sides.

9 A work holder comprising a guide lxloek and three guide plates adapt/ed to engage and guide evlindrical blanks along,r the grinding surfaceyof a grinding Wheel turning on a horizontal "axis, `the middle guide being at substantially right angles to the ripper guide and at an an le of substantially seventy and one-half i egrees to the lower guide, the bearing end of the middle guide .beinget right angles to its parallel sides and the hearing end of thelower guide being at an. angle of substantially forty five degrees rto its parallel sides, and means to support the guides permitting them to turn as a unit about tlieaxis of the blanks.

t0. A work holder comprising a guide block and threey guide plates adapted to engege and guide cylindrionl blanks along the grindingg;A surface of e grinding wheel turning on a horizontal axis, the middle guide being et substantially right angles to the upper guide and at an :ingle of substantially seventy six and oneind degrees to the lower guide. the hearing end of the middle guide being at right angles to its parallel sides and the bearing end 'of the lower guide being :11.` an angle of substantially forty ve degrees to its parallel sides, and means to support the guides permitting them to turn as a unit 'about am axis perpendicular' to the fare of. the wheel in a radial plane thereof.

HARRY J. SVVANSON. 

